Guy’s & St. Thomas’ Hospitals, London

While the history of Guy’s and St. Thomas’ stretches back almost a millennium, the hospitals have a well deserved reputation for looking to the future.

Their decision to commission the building of a TomoTherapy treatment centre underlines a desire to offer the latest medical advances to its patients. Calder Industrial Materials, the European leaders in lead radiation shielding, provided a bespoke solution capable of satisfying the exacting requirements of this unique project.

Safety is paramount

Building a new high radiation unit inside the existing hospital structure presented several challenges for The Trust’s design team. Satisfying their desire to create the most pleasant treatment facility possible within the physical constraints of the site led them to Calder. Calder were asked to supply lead shielding that guaranteed operator safety and maximised available floor space.

Bespoke lead shielding

The modular design of Calder’s Chevron Rail System was perfectly suited to the limited space available at Guy’s and St. Thomas’. Working closely with the TomoTherapy® machine suppliers and QMP Consultants they developed a bespoke shielding scheme which varied overall wall thicknesses without compromising safety.

I have been really impressed with the commitment and dedication to doing a good job shown by the Calder team. They were really helpful with problem solving and have been very responsive to our challenging shielding requirements for this build.

David Gallacher, Deputy Radiation Protection Advisor, Guy's and St Thomas' NHS Foundation Trust


In order to minimise disruption to existing hospital services, only 6 weeks were available for the construction of the radiation shielding system in the new TomoTherapy® room.


These busy hospitals in the centre of London treat over 900,000 patients each year. Ensuring their clinical performance was not impacted by the build was paramount.

Project Controllers

Overall responsibility lay with Guy's and St. Thomas' NHS Foundation trust.

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